This is a common problem. When there is increased pressure on the bladder, for example, when walking or coughing, you can't hold the urine. If that's the case, you should avoid lifting heavy loads as much as possible. If you can't avoid carrying heavy things, correct posture is absolutely essential
Lift correctly: Before you lift anything, you should stand with your feet pelvis-width apart. Squat down. Your back should remain straight. To practise, you can place an empty laundry basket in front of you. Push the pelvis back and try to stay upright anyway. Your back will thank you too. The load should be carried as close to the body as possible and the weight should be distributed on both arms. Tighten the pelvic floor muscles as well. The heavier the object, the greater the strain on the pelvic floor and other muscles. Also pay attention to your breathing. If you breathe incorrectly at the moment of physical exertion, this will counteract all your efforts. Holding your breath increases pressure on the pelvic floor. So, exhale when lifting! If you then also breathe into your belly rather than just your chest, you'll relieve pressure on the bladder in the best possible way.